Piston construction, packing



Patented Oct. 16, 1945 y 2ss7,1s1 PISTON CONS'IBUCTION, PAC KING Antliony Procter, NewcatlEz-upon-Tynel,

England UNITED ;STATES PATENT OFFICE Original appllcatlon January 24,1942, Serlal N0. I

428,140. Dlvided und thls appllcatlon Dezember 10, 1942, Sex-[a1 N0. 468,489. I1'1'.Great Britain February 14, 1941 This invention relates to paking-devices for is occupied by an annular metal piece er pieces plungers und plstons, and its object ls to provide constituting a 'dnmmy otche profile of the base dev1ces o! this kind wlth a firm base portion, this portion. On completion cf the moulding and application being a. dlvision 01 my copendiug vulcanising 'ot the rubber portion, the metal appllcation Seria1N0.428140. dummy is removed trom the mould leaviug a cav- These packing devlces for plungers and pisity lnto which the synthetic resln moulding powtons, ma.y be U, cup or hat: washem. der is lntroduced und in which lt is fused.

More particularly the objet cf the present in- I1: may be c0nvenient to pre'ss and shape the ventlon 1s to provide a U, hat or cup sealing rubber portion first without however vulcanislns washer composed of a reslllent synthetlc or natuer completely vulcanising it, and to mould and set m1 rubber (Jointly herelnafter referred to a.s the synthetlc resin simultaneously with the vulrubber) flanged seallng portion bonded to a canisa.tlonor completion o! the vulcanisation o1 sxmthetic resin base portion. the rubber portion. The rubber in such Oase By synthetic resin is meant a. synthetlc reslnbelng practlcally in its flnlshed shape, it is easy ous material which on he8ting to a certain tem- 5 to control the exact position of the junction beperature fuses or seitens. und Sets, or on cooling tween the synthetic resin and the rubber. The sets, lnto a hard and rigid body. Suitable mashaplng of the rubber portion may be effected in terials of this kind which fuse 8nd s et lrreversia. die other than the mould in which the simulbly wh1lst still hat are for example phe'nol-dfortaneous curing oi the rubber and sYhthetic resin maldehyde and urea-iormaldehyde synthetio resis subsequenth effected.

ins. These reslns a'.re usually introduced into a The bondlns 013 he r ber portion to the synmould in the form of a more or lesS granular powthetic resln p'0rtion can be promoted by beads or der er as tablets of comDressed powder. v recesses, for instance of dovetail section, bein F'0r the above purpose, according to the inVenmoulded on or in the respective neck portion of tion, a. U hat or cup sealing washer, is compnsed the tormer which becomes enclosed am! pomot a. resllient rubber sealing flanged portlon und pressed or occupied, by synthetic resin on the a synthetic resin base portion moulded by heat latter fusing or softening and setting.

und sei; in interlocking contact wlth the rubber A piston embodying a representative example Seal1ng nged P rtion. of a cup sea.llng washer in accordance .with the The ynthetic resin may be bonded to the inventionis illuStratea in axia1 sectlon 0x1 the rubber solely by fusion or sottenlng und setting accompanyins drawing. 01 the 1'0rmer merely in contact w1th the latter. A cup washerls shown in the drawing conslst- However, to ensure a reliable band between the Ing o! a rubber portion c having a substantially two materials, an lntertylng fabrlc, composed ax1a1ly dlrected perlpheral flange c A sy for instance 01 a. woven fabrlc wlre ganze o1 pathetic resin base d, constituting a. nisten, has been per, or perforated sheet metal, may be embedded cast in contct with the rubber portion c through in the rubber and extend into and become emthe perforations of an interposed wavy sheet e bedded in the fused 0x softened synthetic resin, 01 perforated metal having an afi1nity for rubor may be merely located a1; the junction between her. such as brass. In addition to the direct bond th m The jun ifln may have a. mechanically 40 o1 the synthetic resin through the perforations. interlocked structure.

The bonding o! the rubber portlon o1 a rubber bouding o! the rubber to the metal and the interflanged sealing washer to the synthetic resin base locklngo1 the synthetlc resin with the metal there ls an lndlrect bond due to the chemica] portion can be effected by enclosing the rubber thmugh and behind the 'perforations thereofl portion 01' the seal ing washer in a. mould having The sheet e cou1d, alternatively, be a shee t Of a cavity 01 the proflle of the complete Washer staut rubber-aiflnitive metal ganze. The synand thereafter moulding the synthetic resn base thetic resin piston d has also been cast around portion ininterlocklng contact with the rubber und in interlocked engagement with the end of' portlon, from synthetic resln mouldlng powder a metal pist0n r0d f, between collars f f on the introduced into und filling the remainder of the rod. The collar f at the extremity is embedded cavity. in the rubber c.

The mould may be fixst used to mould am: vul- In all cases at least part 01 the synthetic resin canise the rubber portlon of the sealing washer, cnn be introduced into the mould in the form whllst the portlonof the cavity wherein the syno1 fabric or pa.pe;- impregnated with synthetic thetic resin base portlon is subsequently moulded rasin as an alternative to synthetic resln powder,

1. A piston corixprising, a fleidbie ri1bber sealin: flanged portion, a. rigid base portion composed of moulded smthetic resin, und interposed between said rubber D0l'tion am! sald synthetic resin portiona. sheet of material afl1nitive and chemically b0ndd to sa.id rubber anti presenting i.niierstices penetrated by said synthetic resin.

2. A piston comprising, a. flexible rubber se a ling flanged portion, a. rigid base portion of mould ed synthetic resin, and intemosed between said rubber portion und sa.id synthetic resin Portion l periorated metal sheet s.fllnitive und chemicaily bondgd 110 sald rubber with said syntbetic reain penetrating the pertorations thereot.

3. A nisten comprising, a flexible rubber seaiing flanged portion, a rigid base portion composed o! mouldecl synthetic r'esin, und interposed between s9.id;tubber portion and said synthetic resin Portion a. wavy sheet of material afiinitive und chemically bonded to said rubber and presenting interstices penetrated by sa.id synthetic' resin.

4. A nisten comprising, a. flexible rubber seaiing flangecl portion, a. rigid base porticm of moulded synthetlc resin, and interposed between seid rubber portion'and sald synthetic resin portion .a wavy perforated metal sheei; afilnltive und chemically bonded to said rubber wlth said synthetic resin penetrating the perforations thereof.

ANTI-IONY PROCTER. 

